Siemens SIMATIC PROFINET Parts list manual

PROFINET with STEP 7 V14
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SIMATIC
PROFINET
PROFINET with STEP 7 V14
Function Manual
09/2016
A5E03444486
-AG
Preface
Documentation guide
1
Description
2
Parameter
assignment/addressing
3
Diagnostics
4
Functions
5

Siemens AG
Division Digital Factory
Postfach 48 48
90026 NÜRNBERG
GERMANY
A5E03444486-AG
Ⓟ
08/2016 Subject to change
Copyright © Siemens AG 2013 - 2016.
All rights reserved
Legal information
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CAUTION
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NOTICE
indicates that property damage can result if proper precautions are not taken.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.
Qualified Personnel
The product/system described in this documentation may be operated only by
personnel qualified
for the specific
task in accordance with the relevant documentation, in particular its warning notices and safety instructions.
Qualified personnel are those who, based on their training and experience, are capable of identifying risks and
avoiding potential hazards when working with these products/systems.
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Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
documentation. If products and components from other manufacturers are used, these must be recommended
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ambient conditions must be complied with. The information in the relevant documentation must be observed.
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Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.

PROFINET with STEP 7 V14
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Preface
Purpose of the documentation
This function manual provides an overview of the PROFINET communication system with
SIMATIC STEP 7 V14.
STEP 7 V14 is integrated into the powerful graphical Totally Integrated Automation Portal
(TIA Portal), the new integration platform for all automation software tools.
This function manual supports you in planning a PROFINET system. The manual is
structured into the following subject areas:
●PROFINET basics
●PROFINET diagnostics
●PROFINET functions
Basic knowledge required
The following knowledge is required in order to understand the manual:
●General knowledge of automation technology
●Knowledge of the industrial automation system SIMATIC
●Knowledge about the use of Windows-based computers
●Knowledge about how to use STEP 7 (TIA Portal)
Scope
This documentation is the basic documentation for all SIMATIC products from the
PROFINET environment. The product documentation is based on this documentation.
The examples are based on the functionality of the S7-1500 automation system.

Preface
PROFINET with STEP 7 V14
Function Manual, 09/2016, A5E03444486-AG 5
Changes compared to previous version
This manual encompasses the following new functions compared to the previous version
(version 12/2014):
Function
Applications
User benefits
PROFINET IO on the 2nd
PROFINET interface
You can operate another
PROFINET IO system on the CPU or
connect additional IO devices.
You use a fieldbus type in the plant.
The CPU can perform fast and deterministic data
exchange as an I-device with a higher-level con-
troller (PROFINET/Ethernet) through the second
line.
IRT with very short data cycle
times down to 125 µs
You realize high-end applications with
IO communication which place very
high performance demands on the IO
processing.
You make PROFINET IO communication and
standard communication possible via one cable
even with a send clock of 125 µs.
MRPD: Media Redundancy
with Planned Duplication of
frames
PROFINET IO IRT enables you to
realize applications that place particu-
larly high demands on the reliability
and accuracy (isochronous mode).
By sending the cyclic IO data in both directions in
the ring, the communication to the IO devices is
maintained even when the ring is interrupted and
does not result in device failure even with fast
update times. You achieve higher reliability than
with MRP.
PROFINET performance
upgrade
You can implement applications with
high speed and send clock require-
ments. This is interesting for applica-
tions with high demands on
performance.
Better utilization of the bandwidth results in short
reaction times.
Limitation of the data infeed
into the network
You limit the network load for standard
Ethernet communication to a maximum
value.
You flatten peaks in the data feed.
You share the remaining bandwidth based on
demand.
Conventions
STEP 7:
We refer to "STEP 7" in this documentation as a synonym for the configuration and
programming software "STEP 7 as of V12 (TIA Portal)" and subsequent versions.
This documentation contains pictures of the devices described. The figures may differ
slightly from the device supplied.
You should also pay particular attention to notes such as the one shown below:
Note
A note contains important information on the product, on handling of the product and on the
section of the documentation to which you
should pay particular attention.
See also
PRODIS (http://www.siemens.com/simatic-tech-doku-portal)
Catalog (http://mall.industry.siemens.com)

Preface
PROFINET with STEP 7 V14
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Security information
Siemens provides products and solutions with industrial security functions that support the
secure operation of plants, systems, machines and networks.
In order to protect plants, systems, machines and networks against cyber threats, it is
necessary to implement – and continuously maintain – a holistic, state-of-the-art industrial
security concept. Siemens’ products and solutions only form one element of such a concept.
Customer is responsible to prevent unauthorized access to its plants, systems, machines
and networks. Systems, machines and components should only be connected to the
enterprise network or the internet if and to the extent necessary and with appropriate security
measures (e.g. use of firewalls and network segmentation) in place.
Additionally, Siemens’ guidance on appropriate security measures should be taken into
account. For more information about industrial security, please visit
(http://www.siemens.com/industrialsecurity).
Siemens’ products and solutions undergo continuous development to make them more
secure. Siemens strongly recommends to apply product updates as soon as available and to
always use the latest product versions. Use of product versions that are no longer supported,
and failure to apply latest updates may increase customer’s exposure to cyber threats.
To stay informed about product updates, subscribe to the Siemens Industrial Security RSS
Feed under (http://www.siemens.com/industrialsecurity).
Siemens Industry Online Support
You can find current information on the following topics quickly and easily here:
●
Product support
All the information and extensive know-how on your product, technical specifications,
FAQs, certificates, downloads, and manuals.
●
Application examples
Tools and examples to solve your automation tasks – as well as function blocks,
performance information and videos.
●
Services
Information about Industry Services, Field Services, Technical Support, spare parts and
training offers.
●
Forums
For answers and solutions concerning automation technology.
●
mySupport
Your personal working area in Industry Online Support for messages, support queries,
and configurable documents.
This information is provided by the Siemens Industry Online Support in the Internet
(http://www.siemens.com/automation/service&support).

Preface
PROFINET with STEP 7 V14
Function Manual, 09/2016, A5E03444486-AG 7
Industry Mall
The Industry Mall is the catalog and order system of Siemens AG for automation and drive
solutions on the basis of Totally Integrated Automation (TIA) and Totally Integrated Power
(TIP).
Catalogs for all the products in automation and drives are available on the Internet
(https://mall.industry.siemens.com).

PROFINET with STEP 7 V14
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Table of contents
Preface ................................................................................................................................................... 4
1 Documentation guide ............................................................................................................................ 11
2 Description............................................................................................................................................ 15
2.1 Introduction to PROFINET ..................................................................................................... 15
2.1.1 PROFINET terms................................................................................................................... 17
2.1.2 Basic terminology of communication ..................................................................................... 20
2.1.3 PROFINET interface .............................................................................................................. 23
2.1.4 Implementation of the PROFINET device model in SIMATIC ............................................... 26
2.2 Setting up PROFINET............................................................................................................ 27
2.2.1 Active Network Components.................................................................................................. 28
2.2.2 Cabling technology ................................................................................................................ 30
2.2.3 Wireless design...................................................................................................................... 33
2.2.3.1 Basics..................................................................................................................................... 33
2.2.3.2 Tips on assembly ................................................................................................................... 35
2.2.4 Network security..................................................................................................................... 36
2.2.4.1 Basics..................................................................................................................................... 36
2.2.4.2 Network components and software........................................................................................ 38
2.2.4.3 Application example............................................................................................................... 39
3 Parameter assignment/addressing ........................................................................................................ 41
3.1 Assigning an IO device to an IO controller ............................................................................ 42
3.2 Device name and IP address................................................................................................. 44
3.2.1 Device name .......................................................................................................................... 45
3.2.2 IP address .............................................................................................................................. 46
3.2.3 Assigning a device name and IP address.............................................................................. 49
3.2.4 Assign device name via communication table ....................................................................... 54
3.2.5 Permitting changes to the device name and IP address directly on the device .................... 57
3.3 Configuring topology .............................................................................................................. 59
3.3.1 Topology view in STEP 7....................................................................................................... 61
3.3.2 Interconnecting ports in the topology view............................................................................. 64
3.3.3 Interconnecting ports - Inspector window .............................................................................. 65
3.3.4 Automatic assignment of devices by offline/online comparison ............................................ 66
3.3.5 Apply the port interconnections identified online manually to the project.............................. 67
3.3.6 Include the devices identified online manually in the project................................................. 68
3.3.7 Automatic assignment of devices by advanced offline/online comparison............................ 68
4 Diagnostics ........................................................................................................................................... 69
4.1 Diagnostics mechanisms of PROFINET IO ........................................................................... 69
4.1.1 Diagnostics levels in PROFINET IO ...................................................................................... 71
4.1.2 I&M data (identification and maintenance) ............................................................................ 73
4.1.3 Loading I&M data to PROFINET IO devices and your modules............................................ 73
4.2 Diagnostics using status LEDs .............................................................................................. 75

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4.3 Diagnostics via the display of the S7-1500 CPUs ..................................................................76
4.4 Diagnostics via Web server ....................................................................................................80
4.5 Diagnostics in STEP 7 ............................................................................................................83
4.6 Extended maintenance concept .............................................................................................86
4.7 Diagnostics of the network topology .......................................................................................88
4.8 Diagnostics in the user program .............................................................................................89
4.8.1 Diagnostics and configuration data records ...........................................................................89
4.8.2 Evaluate diagnostics in the user program ..............................................................................91
5 Functions.............................................................................................................................................. 93
5.1 Connecting other bus systems ...............................................................................................94
5.1.1 Connecting other bus systems ...............................................................................................94
5.1.2 Linking PROFINET and PROFIBUS.......................................................................................95
5.1.3 Connect the DP slave via the IE/PB Link to a PROFINET IO system....................................96
5.2 Intelligent IO devices (I-devices).............................................................................................98
5.2.1 I-device functionality ...............................................................................................................98
5.2.2 Properties and Advantages of the I-Device ............................................................................99
5.2.3 Characteristics of an I-Device...............................................................................................100
5.2.4 Data Exchange between higher- and lower-level IO system................................................104
5.2.5 Configuring the I-device ........................................................................................................106
5.2.6 Program examples................................................................................................................109
5.2.7 Diagnostics and interrupt characteristics..............................................................................112
5.2.8 Rules for the Topology of a PROFINET IO System with I-Device........................................114
5.2.9 Boundary conditions when using I-devices ..........................................................................118
5.2.10 Configuring PROFIenergy with I-devices..............................................................................118
5.3 Shared device .......................................................................................................................121
5.3.1 Useful information on shared devices...................................................................................121
5.3.2 Configuring shared device ....................................................................................................124
5.3.3 Configuring an I-device as a shared device..........................................................................128
5.3.4 Module-internal shared input/shared output (MSI/MSO)......................................................137
5.4 Media redundancy (ring topologies) .....................................................................................144
5.4.1 Media Redundancy Protocol (MRP) .....................................................................................145
5.4.2 Configuring media redundancy.............................................................................................148
5.4.3 Media Redundancy with Planned Duplication of frames (MRPD) ........................................
150
5.4.4 Multiple rings.........................................................................................................................152
5.5 Real-time communication .....................................................................................................157
5.5.1 Introduction ...........................................................................................................................157
5.5.2 RT .........................................................................................................................................158
5.5.3 IRT ........................................................................................................................................159
5.5.4 Comparison of RT and IRT...................................................................................................162
5.5.5 Configuring PROFINET IO with IRT .....................................................................................162
5.5.6 Setting the bandwidth usage for the send clock ...................................................................166
5.5.7 Setup recommendations for optimizing PROFINET .............................................................167
5.5.8 Limitation of the data infeed into the network .......................................................................171

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5.6 PROFINET with performance upgrade................................................................................ 172
5.6.1 Dynamic frame packing ....................................................................................................... 173
5.6.2 Fragmentation ...................................................................................................................... 175
5.6.3 Fast forwarding .................................................................................................................... 176
5.6.4 Configuration of IRT with high performance ........................................................................ 177
5.6.5 Sample configuration for IRT with high performance........................................................... 181
5.7 Isochronous mode ............................................................................................................... 182
5.7.1 What is isochronous mode?................................................................................................. 182
5.7.2 Use of isochronous mode .................................................................................................... 183
5.7.3 Isochronous applications ..................................................................................................... 183
5.7.4 Time sequence of synchronization ...................................................................................... 185
5.7.5 Basics of Programming........................................................................................................ 186
5.7.6 Program processing according to the IPO model with application cycle = 1....................... 187
5.7.7 Program execution according to the IPO model with application cycle > 1......................... 188
5.7.8 Configuring isochronous mode ............................................................................................ 189
5.7.9 Setting the application cycle and delay time........................................................................ 192
5.8 Device replacement without exchangeable medium ........................................................... 193
5.8.1 Device replacement without exchangeable medium/PG function ....................................... 194
5.8.2 Replacing an IO device without exchangeable medium...................................................... 196
5.8.3 Permit overwriting of PROFINET device name ................................................................... 197
5.9 Standard machine projects .................................................................................................. 199
5.9.1 Multiple use IO systems....................................................................................................... 200
5.9.1.1 What you should know about multiple use IO systems ....................................................... 200
5.9.1.2 Configuring multiple use IO systems ................................................................................... 204
5.9.1.3 Adapt multiple use IO systems locally ................................................................................. 207
5.9.2 Configuration control for IO systems ................................................................................... 209
5.9.2.1 Information about configuration control of IO systems ........................................................ 209
5.9.2.2 Configuring IO devices as optional ...................................................................................... 212
5.9.2.3 Enabling optional IO devices in the program ....................................................................... 213
5.9.2.4 Configuring flexible order of IO devices............................................................................... 219
5.9.2.5 Customizing arrangement of IO devices in the program ..................................................... 222
5.9.2.6 System behavior and rules .................................................................................................. 225
5.10 Saving energy with PROFIenergy........................................................................................ 227
5.11 Docking systems .................................................................................................................. 229
5.11.1 Configuring docking systems ............................................................................................... 232
5.12 Accelerating startup ............................................................................................................. 234
5.12.1 Options for accelerating the startup of IO devices............................................................... 234
5.12.2 Prioritized startup ................................................................................................................. 236
5.12.3 Configuring prioritized startup.............................................................................................. 237
5.12.4 Optimize the port settings .................................................................................................... 239
5.12.5 Optimize the cabling of the ports ......................................................................................... 240
5.12.6 Measures in the user program ............................................................................................. 241
Glossary ..............................................................................................................................................242
Index ...................................................................................................................................................255

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Documentation guide
1
The documentation for the SIMATIC S7-1500 automation system, for CPU 1516pro-2 PN
based on SIMATIC S7-1500, and for the distributed I/O systems SIMATIC ET 200MP,
ET 200SP and ET 200AL is divided into three areas.
This division allows you easier access to the specific information you require.
Basic information
System manuals and Getting Started manuals describe in detail the configuration,
installation, wiring and commissioning of the SIMATIC S7-1500, ET 200MP, ET 200SP and
ET 200AL systems; use the corresponding operating instructions for CPU 1516pro-2 PN.
The STEP 7 online help supports you in configuration and programming.
Device information
Product manuals contain a compact description of the module-specific information, such as
properties, terminal diagrams, characteristics and technical specifications.

Documentation guide
PROFINET with STEP 7 V14
12 Function Manual, 09/2016, A5E03444486-AG
General information
The function manuals contain detailed descriptions on general topics such as diagnostics,
communication, Motion Control, Web server, OPC UA.
You can download the documentation free of charge from the Internet
(http://w3.siemens.com/mcms/industrial-automation-systems-simatic/en/manual-
overview/Pages/Default.aspx).
Changes and additions to the manuals are documented in product information sheets.
You will find the product information on the Internet:
●S7-1500/ET 200MP (https://support.industry.siemens.com/cs/us/en/view/68052815)
●ET 200SP (https://support.industry.siemens.com/cs/us/en/view/73021864)
●ET 200AL (https://support.industry.siemens.com/cs/us/en/view/99494757)
Manual Collections
The Manual Collections contain the complete documentation of the systems put together in
one file.
You will find the Manual Collections on the Internet:
●S7-1500/ET 200MP (https://support.industry.siemens.com/cs/ww/en/view/86140384)
●ET 200SP (https://support.industry.siemens.com/cs/ww/en/view/84133942)
●ET 200AL (https://support.industry.siemens.com/cs/ww/en/view/95242965)
"mySupport"
With "mySupport", your personal workspace, you make the best out of your Industry Online
Support.
In "mySupport", you can save filters, favorites and tags, request CAx data and compile your
personal library in the Documentation area. In addition, your data is already filled out in
support requests and you can get an overview of your current requests at any time.
You must register once to use the full functionality of "mySupport".
You can find "mySupport" on the Internet (https://support.industry.siemens.com/My/ww/en).
"mySupport" - Documentation
In the Documentation area in "mySupport" you can combine entire manuals or only parts of
these to your own manual.
You can export the manual as PDF file or in a format that can be edited later.
You can find "mySupport" - Documentation on the Internet
(http://support.industry.siemens.com/My/ww/en/documentation).

Documentation guide
PROFINET with STEP 7 V14
Function Manual, 09/2016, A5E03444486-AG 13
"mySupport" - CAx data
In the CAx data area in "mySupport", you can access the current product data for your CAx
or CAe system.
You configure your own download package with a few clicks.
In doing so you can select:
●Product images, 2D dimension drawings, 3D models, internal circuit diagrams, EPLAN
macro files
●Manuals, characteristics, operating manuals, certificates
●Product master data
You can find "mySupport" - CAx data on the Internet
(http://support.industry.siemens.com/my/ww/en/CAxOnline).
Application examples
The application examples support you with various tools and examples for solving your
automation tasks. Solutions are shown in interplay with multiple components in the system -
separated from the focus on individual products.
You will find the application examples on the Internet
(https://support.industry.siemens.com/sc/ww/en/sc/2054).
TIA Selection Tool
With the TIA Selection Tool, you can select, configure and order devices for Totally
Integrated Automation (TIA).
This tool is the successor of the SIMATIC Selection Tool and combines the known
configurators for automation technology into one tool.
With the TIA Selection Tool, you can generate a complete order list from your product
selection or product configuration.
You can find the TIA Selection Tool on the Internet
(http://w3.siemens.com/mcms/topics/en/simatic/tia-selection-tool).

Documentation guide
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SIMATIC Automation Tool
You can use the SIMATIC Automation Tool to run commissioning and maintenance activities
simultaneously on different SIMATIC S7 stations as a bulk operation, independently of the
TIA Portal.
The SIMATIC automation tool provides a variety of functions:
●Scanning of a PROFINET/Ethernet plant network and identification of all connected CPUs
●Address assignment (IP, subnet, gateway) and station name (PROFINET device) to a
CPU
●Transfer of the date and programming device/PC time converted to UTC time to the
module
●Program download to CPU
●Operating mode switchover RUN/STOP
●CPU localization by means of LED flashing
●Reading out CPU error information
●Reading of CPU diagnostic buffer
●Reset to factory settings
●Updating the firmware of the CPU and connected modules
You can find the SIMATIC Automation Tool on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/98161300).
PRONETA
With SIEMENS PRONETA (PROFINET network analysis), you analyze the plant network
during commissioning. PRONETA features two core functions:
●The topology overview independently scans PROFINET and all connected components.
●The IO check is a fast test of the wiring and the module configuration of a plant.
You can find SIEMENS PRONETA on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/67460624).

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Description
2
2.1
Introduction to PROFINET
What is PROFINET IO?
Within the framework of Totally Integrated Automation (TIA), PROFINET IO is the logical
further development of:
●PROFIBUS DP, the established fieldbus and
●Industrial Ethernet
PROFINET IO is based on 20 years of experience with the successful PROFIBUS DP and
combines the normal user operations with the simultaneous use of innovative concepts of
Ethernet technology. This ensures the integration of PROFIBUS DP into the PROFINET
world.
PROFINET IO as the Ethernet-based automation standard of PROFIBUS/PROFINET
International defines a cross-vendor communication, automation, and engineering model.
Objectives of PROFINET
The objectives of PROFINET:
●Industrial networking, based on Industrial Ethernet (open Ethernet standard)
●Compatibility of Industrial Ethernet and standard Ethernet components
●High robustness due to Industrial Ethernet devices. Industrial Ethernet devices are suited
to the industrial environment (temperature, noise immunity, etc.).
●Use of IT standards such as TCP/IP, http.
●Real-time capability
●Seamless integration of other fieldbus systems

Description
2.1 Introduction to PROFINET
PROFINET with STEP 7 V14
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Implementation of PROFINET in SIMATIC
PROFINET is implemented in SIMATIC as follows:
●We have implemented communication between field devices in SIMATIC with
PROFINET IO
.
●Installation technology and network components are available as SIMATIC NET products.
●Ethernet standard protocol and procedures (e.g., SNMP = Simple Network Management
Protocol for network parameter assignment and diagnostics) are used for remote
maintenance and network diagnostics.
Figure 2-1 PROFINET overview configuration
STEP 7
The STEP 7 engineering tool supports you in setting up and configuring an automation
solution. STEP 7 provides a uniform application view over all bus systems.

Description
2.1 Introduction to PROFINET
PROFINET with STEP 7 V14
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Documentation from PROFIBUS & PROFINET International on the Internet
You will find numerous documents on the topic of PROFINET at the Internet address
(http://www.profibus.com) of the "PROFIBUS & PROFINET International" PROFIBUS user
organization, which is also responsible for PROFINET.
Additional information can be found on the Internet (http://www.siemens.com/profinet).
Overview of the most important documents and links
A compilation of the most important PROFINET application examples, FAQs and other
contributions in the Industry Online Support is available in this FAQ
(https://support.industry.siemens.com/cs/ww/en/view/108165711).
2.1.1
PROFINET terms
Definition: Devices in the PROFINET environment
In the PROFINET environment, "device" is the generic term for:
●Automation systems (PLC, PC, for example)
●Distributed I/O systems
●Field devices (for example, hydraulic devices, pneumatic devices)
●Active network components (for example, switches, routers)
●Gateways to PROFIBUS, AS interface or other fieldbus systems

Description
2.1 Introduction to PROFINET
PROFINET with STEP 7 V14
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PROFINET IO devices
The following graphic shows the general names used for the most important devices in
PROFINET. In the table below the graphic you can find the names of the individual
components in the PROFINET IO context.
Number
PROFINET
Explanation
①
PROFINET IO System
②
IO controller Device used to address the connected IO devices.
This means that: The IO controller exchanges input
and output signals with field devices.
③
Programming device / PC
(PROFINET IO supervisor)
PG/PC/HMI device used for commissioning and for
diagnostics
④
PROFINET/Industrial Ethernet
Network infrastructure
⑤
HMI (Human Machine Interface)
Device for operating and monitoring functions.
⑥
IO device A distributed field device that is assigned to one of
the IO controllers (e.g., Distributed IO, valve termi-
nals, frequency converters, switches with integrat-
ed PROFINET IO functionality)
⑦
I-device
Intelligent IO device
Figure 2-2 PROFINET devices

Description
2.1 Introduction to PROFINET
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IO communication via PROFINET IO
The inputs and outputs of distributed I/O devices are read and written by means of
PROFINET IO using what is referred to as IO communication. The following figure provides
an overview of IO communication by means of PROFINET IO.
A
IO controller - IO controller communication via PN/PN coupler
B
IO controller - I-device communication
C
IO controller - IO-device communication
Figure 2-3 IO communication via PROFINET IO

Description
2.1 Introduction to PROFINET
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IO communication via PROFINET IO
Table 2- 1 IO communication via PROFINET IO
Communication between ...
Explanation
IO controllers and IO devices The IO controller sends data cyclically to the IO devices of its PROFINET IO system and
receives data from these devices.
IO controller and I-device
A fixed quantity of data is transferred cyclically between the user programs in CPUs of IO
controllers and I-devices.
The IO controller does not access the I/O module of the I-device, but instead accesses
configured address ranges, i.e. transfer ranges, which may be located inside our outside
the process image of the CPU of the I-device. If parts of the process image are used as
transfer ranges, it is not permitted to use these for real I/O modules.
Data transfer takes place using load- and transfer operations via the process image or
via direct access.
IO controller and IO controller
A fixed quantity of data is cyclically transferred between the user programs in CPUs of IO
controllers. A PN/PN coupler is required as additional hardware.
The IO controllers mutually access configured address ranges, i.e. transfer ranges,
which may be located inside or outside the process image of the CPU. If parts of the
process image are used as transfer ranges, it is not permitted to use these for real I/O
modules.
Data transfer takes place using load- and transfer operations via the process image or
via direct access.
See also
Network security (Page 36)
Functions (Page 93)
Communication (http://support.automation.siemens.com/WW/view/en/59192925)
2.1.2
Basic terminology of communication
PROFINET communication
PROFINET communication takes place via Industrial Ethernet. The following transmission
types are supported:
●Acyclic transmission of engineering and diagnostics data and interrupts
●Cyclic transmission of user data
The PROFINET-IO communication takes place in real-time.
For additional information on the real-time communication, refer to chapter Real-time
communication (Page 157).